You could use a hands-free device or an earphone.

可以使用免提设备或者耳机。

Use a hands-free device to make your calls and check your voice mail.

使用一个不用手持东东帮助打电话、查看语音信箱。

Experts say people who are concerned about mobile phones can take steps like using a hands-free device.

专家们表示，担心手机辐射的人们可以采用一些措施，例如使用免提装置。

Experts say people who are concerned about mobile phones can take steps like using a hands-free device.

专家说，担心手机会造成危害的人可以使用免提系统。

Ditched the landline? Use a hands-free device like a headset or talk on speaker phone (preferably the former when in public).

除了座机，用免提设备像耳机或者用扬声器电话交谈(公开场合前者更好)。